There are zero GFCI outlets or breakers in this house. Built in the mid-70's, no major renovations other than a really cruddy tile floor that at least was more attractive than the mustard yellow vinyl tile that was under the carpet sections I yanked.

For example, I just took down a hard-wired smoke alarm dated 1975. Who knows how long since it's worked but I'm just now getting to evaluating any electrical boxes I didn't install. The hard-wired ADT system is about to get the can. I just found the control box today (in the pantry, had always thought it went to the phone) and the battery has been disconnected for who knows how long but I'm going to search and make sure there's not a transformer plugged into an outlet somewhere (it may be long gone) before I yank stuff from the wall, tape the wires and push them into the wall so I can repair them.